| A | B |
|---|
| evolution | The process by which species change over time |
| homologous structure | Similar structures that have different functions |
| vertebrate | An animal with a backbone |
| analogous structure | Different organisms and different structures but the same function |
| vestigial structure | Body parts that do not seem to paly a role in the body funtions of the organism |
| embryo | Early stage of development of an organism |
| embryology | The study of embryos |
